Crossword Genius

Nitric or citric? (4)

Ross

I believe the answer is:

acid

(Other definitions for acid that I've seen before include "Sour - type of rain or drop" , "Substance with pH of less than 7" , "Caustic liquid of many kinds" , "Sour, sharp-tasting" , "Bitter substance" .)

I've seen this clue in The Telegraph.
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